Philips DVP520/05 - Disc Cannot Be Read

4-4
Disc cannot be read
.
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Disc cannot be read.
Check the loaded circuit
1.Check voltage on pin 52 of U1 varies
between 0 and 3.3V:
Æ
3.3V for VCD
Æ
0V for DVD
2.Check whether peripheral components
are eroded or defect
Check the FFC connection
between 24P and the loader.
Check U1 and peripheral components
Re-solder or replace the defective parts
Check the connection
between U4 and U1
Fix connection
Replace U1 or loader.
Yes
Check whether there is lase
r
voltage (2V for VCD and 2.2V fo
r
DVD) on Collector of Q5 &Q6
Check whether there is RFO signal
on pin17 of CN2. (The normal RFO
signal is a clear reticulated wave)
Trouble shooting chart
Check whether U1, U2, U4
and peripheral components
are eroded or badly soldered.